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#include "udf.h"
DEFINE_SOURCE(heat_flux,cell,thread,ds,eqn)
{
real x[ND_ND];
real oq,t0,v0,Q,time,cs,hh;
real r,rh;
real source_heat;
cell_t c;
C_CENTROID(x,c,thread);
Q=100000;           /*ǹ¹¦ÂÊ*/
cs=3/pow(oq,2);   /*ÐÎ×´Òò×Ó*/
hh=150e-3;         /*ÈÈÔ´¸ß¶È*/
oq=60e-3;      /*ÈÈÔ´°ë¾¶*/
r=sqrt(pow(x[0]-0.35,2)+pow(x[1]+0.35,2));   /*×ø±êÓëÈÈÔ´ÖÐÐĵľàÀë*/
rh=sqrt(log(hh/x[2])/3.)*oq;              /*Ò»¶¨ÈÈÔ´¸ß¶È¶ÔÓ¦µÄ°ë¾¶rh*/

if (x[2]==0)
{
source_heat=3.*cs*Q/(3.14*hh*(1.-1./exp(3)));
ds[eqn] =0;
}

else if (x[2]>0&&x[2]<=hh&&r<=rh)
{
source_heat=3.*cs*Q/(3.14*hh*(1.-1./exp(3)))*exp(-3.*cs/log10(hh/x[2])*pow(r,2.));
ds[eqn] =0;
}

else
{
source_heat= ds[eqn] =0;
}

return source_heat;
}



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